| (19) |
 |
|
(11) |
EP 0 328 177 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
04.07.1990 Bulletin 1990/27 |
| (43) |
Date of publication A2: |
|
16.08.1989 Bulletin 1989/33 |
| (22) |
Date of filing: 26.01.1989 |
|
| (51) |
International Patent Classification (IPC)4: C11D 17/00 |
|
| (84) |
Designated Contracting States: |
|
CH DE ES FR GB IT LI NL SE |
| (30) |
Priority: |
10.02.1988 GB 8803036
|
| (71) |
Applicants: |
|
- UNILEVER N.V.
3013 AL Rotterdam (NL)
CH DE ES FR IT LI NL SE
- UNILEVER PLC
London EC4P 4BQ (GB)
GB
|
|
| (72) |
Inventors: |
|
- Machin, David
Oxton
Birkenhead L43 6TJ (GB)
- van de Pas, Johannes Cornelis
NL-3136 CV Vlaardingen (NL)
|
| (74) |
Representative: Kan, Jacob Hendrik, Dr. et al |
|
Unilever N.V.
Patent Division
P.O. Box 137
3130 AC Vlaardingen
3130 AC Vlaardingen (NL) |
|
| |
|
(57) Improved flexibility in incorporation of soluble salts in structured aqueous liquid
detergents is provided by incorporating a surfactant with a salting-out resistance
greater than or equal to 6.4 and which has an average alkyl chain length greater than
6 C-atoms provided that the liquid yields substantially no clear liquid active rich
layer upon centrifuging at 750G for 20 hours at 25°C. The salting-out resistance is
the minimum amount in grams equivalent of trisodium nitrilotriacetate added to 1 litre
of a 5% aqueous solution of the surfactant at room temperature, to achieve phase separation
as evidenced by cloudiness.